1. Chemistry Vocabulary and Notes
The Atom
Chemistry
Vocabulary and Notes
Power points are for you to use if you want. Feel free to edit to fit your classroom.

2. What is an atom?
An atom is the smallest particle into which an element (such as gold) can be divided and still maintain the properties of that element.

3. Vocabulary - 1
ELEMENT -substance that cannot be broken down into other substances by chemical/physical means
ATOMIC NUMBER -number of protons in nucleus
ATOMIC MASS UNIT (amu)-unit used to measure particles in atoms
VALENCE ELECTRON - electrons located farthest away from nucleus
CHEMICAL BOND - force that holds chemicals together
Put in foldable – include picture. Spanish word
Assign homework: Use word in a sentence

4. ATOMIC STRUCTURE
Atoms are made up of even smaller particles called protons, neutrons, and electrons.
PROTONS (+)– positively charged particles located in the nucleus
NEUTRONS (0)– electrically neutral particles located in the nucleus
ELECTRONS (-)– negatively charged particles found outside the nucleus

5. ATOM
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6. Atom Notes Nucleus-core of atom, made of proton (+), neutrons
Atom neutral when protons = electrons (-)
Atomic number = number of protons
AMU measures particles in atom
Electrons roam around nucleus in electronic cloud – are in constant motion
Protons have almost 2000 times as much mass as electrons
Electrons attract protons in nearby atoms
Attraction forms molecules

7. Atom Notes - cont.
Atomic Mass = number of protons + number of neutrons
1st shell = 2
2nd shell = 8
3rd shell = 18
4th shell = 32
5th ,6th,7th have various amounts, depending on type of molecule formed with max of 32, 18, and 2 respectively
Most of the atom’s volume is the space where the electrons move

8. Valence Electrons
Are the electrons that are farthest away from the nucleus
Determines many properties of the atom and therefore of the element
Forms chemical bonds with other atoms
Can range from 1 to 8
Are represented by an electron dot diagram
                                                

9. Lewis Electron Dot Diagram
Lewis Electron Dot Diagrams are a type of model that displays the number of valence electrons an atom has. Dots are added one at a time to the outside of the chemical symbol in a circle until they match the number of valence electrons.
Lewis Electron Dot Diagram for Chlorine